i am sure many people have seen this before, but I was only recently exposed to this technique in the Red Sea.
Prior to this, I used to just loop my long hose over the isolator valve and hang the necklace by the bungee.
This method keeps thing more secure. I don’t think it works as well with a silicone necklace.
Credit to Akmed, Omar Tarek’s support guy in Dahab, Egypt.